Power-operated dog for sawmill carriages



Dec. 26, 1950 D. R. M FERON POWER-OPERATED DOG FOR SAWMILL CARRIAGES 5Sheets-Sheet 1 Filed Nov. 27, 1945 INVENTOR DOUGLAS R. MCFERON ATTORNEYDec. 26,1950 D. R. MCFERON POWER-OPERATED nos FOR SAWMILL CARRIAGES 3Sheets-Sheet 2 Filed Nov. 27, 1945 INVENTOR DOUGLAS R. MFERON ATTORNEYDec. 26, 1950 D. R. MCFERO N 2,535,440

POWER-OPERATED DOG FOR SAWMILL CARRIAGES Filed Nov. 27, 1945 sSheefs-Sheet s INVENTOR DOUGLAS R. M FERON ATTORNEY Patented Dec. 26,1950 OFFICE POWER-OPERATED DOG FOR SAWMILL CARRIAGES Douglas R. McFeron,Eugene, Oreg.

Application November 27, 1945, Serial No. 631,033

7 Claims. 1

This invention relates to power operated dogs for sawmill carriages andthe primary object of the invention is to provide a mechanical operateddog that can be set and released by remote control.

A further object of the invention is the provision of an automatic stopthrow-out control disengaging the power from the dog when the dog hasmade contact with the log.

Another object of the invention is the provision of means within the dogfor adjusting the same in or out from the back stands of the carriage.

A still further object is to provide an automatic locking means forholding the dog in dogging position after engaging the log.

These and other incidental objects will be apparent in the drawings,specifications and claims.

Referring to the drawings:

Figure 1 is an end sectional view taken through the cariage adjacent oneof the back stands havin my new and improved dog setting mechanismmounted thereon.

Figure 2 is a sectional view taken through the carriage, back stand anddog setting mechanism on line 22 of Figure 1.

Figure 3 is a fragmentary detail of the back stand and my automatic dogsetter viewed from the opposite side than that shown in Figure 1,illustrating the dog in contact with the log and having just disengagedthe feed mechanism.

Figure 4 is a detailed enlarged fragmentary sectional view, taken online 4-4 of Figure 1, of part of the dog mechanism.

Figure 5 is a side sectional view, taken on line 5-5 of Figure 4,looking in the direction indicated.

Figure 6 is an end sectional View of the dog takon on line 8-45 ofFigure 1.

Figure 7 is a diagrammatic lay out of the electric controls.

Referring now to the drawings, specifically to Figs. 1-3, a typicalsawmill carriage is shown with the usual frame 2, bed plate 3 and backstand 4. This carriage may be of any standard design well known insawmill practice.

My invention comprises a vertically disposed frame 5 mounted on the backstand 4 by suitable holding means, as bolts 6. A vertical sub-frame l isadjustably mounted to the main frame 5 by spacer bolts 8 which aretapped into the frame 7 and work freely within the slots 9 of the mainframe 5, permitting a movement longitudinally between the frame 5 andthe sub-frame l. The sub-frame l is guided in a parallel direction withthe frame 5 by the rib I 0 working within the key way H of the mainframe 5, see Figure 4.

Referring to Figures 1 and 4, a movable dog assembly is indicated ingeneral at E2 and consists of a guide block 83 having channels l4embracing the sub-frame l. The guide block !3 moves freely up and downon the sub-frame.

I will now describe the operation of the dog relative to its movement inand out from the back stand. Referring to Figures 4, 5 and 6, the dog isindicated at i5 and forms part of the flat bar l6, which is slidablmounted within the guide way ll. Rotatably and longitudinally mountedwithin the guide way is a shaft l8, which is held from end movement bythe shoulder l9 and the washer 2d. The washer 23 is held in place by theuniversal joint 2i, which is keyed to the shaft l8 at 22. A screw thread23 is formed on the opposite end of the shaft l8 and is threaded throughthe racks 24, forming part of the flat bar H5.

Located on either end of the racks 24 are openings or spaces 25 allowingthe screw thread 23 to enter limiting the travel of the bar 16, eventhough the shaft l8 continues to revolve. Suitable springs 25 areprovided for rethreading the screw thread 23 into the racks 24 on thereversal in direction of the shaft i8. The shaft I8 is connected to thedrive shaft 2'! by the universal joint 2|. The opposite end of the shaft27 has a gear 28 forming part thereof, the operation of which will bedescribed later.

In order to raise and lower the dog a chain 32 is driven by a motor 33through the speed reducer 33A and sprocket 34. Idler sprockets 35 and 36are journalled to the sub-frame l at 3'! and 38 and have the chain 32running thereover. The ends of the chain are secured at 39 to the dogguide block 53, positioning the dog assembly l2 vertically relative tothe sub-frame. The motor 33 can be run in either direction, therebyraising or lowering the dog assembly, as desired, by a remote controlswitch 32 (Fig. 7).

We will assume that we are going to bring the dog down upon the log 40.The remote switch 32 is closed in the position shown in Figure '7,current will flow from source of supply at 4! through the switch bar 42,conductor 43, through the switch 44 to the motor 33 moving the chain inthe direction of the arrow (Fig. 1) lowering the dog device I 2 to theposition shown in Figure 3. When the dog engages the log, the pressureof the dog against the log will tend to raise the sub-frame 7, throughthe chain 32, against the spring 45, which is fixed at 46 to the upperend of the frame 5 and at 41 to the upper end of the sub-frame. As thisupward movement of the sub-frame 7 takes place, best illustrated inFigure 3, the cable 48 connected to the upper end of the sub-frame 3 at49 will open the switch 44 stopping further rotation of the motor 33.

The motor 33 has a standard magnetic brake assembly which has anoperating arm 60 for applying the brake. A spring 6| applies the brakeand holds the same applied until the electric solenoid E2 is energized,pulling the lever 69 against the action of the gaming 5i therebyreleasing the brake band, not here shown, enclosed within the brakeassembly 5!. When the remote switch 42 is closed in the position shownin Figure 7, energy flows through the -.cqnductor 4!, 43, switch 4conductor 63 andthe solenoid 62, releasing the brake simultaneously withthe starting of the motor. When the switch 126 is opened, by the pullingof the cable .433, the spring 6| will apply the brake, stopping themotor.

In the moving of the dogging unit l2 upwardly or awayfrom the lo theswitch bar 42 is moved to re e ositi n he do t d 1 1 1 s t on ill t atedF e-' los n th eiiit f e; h ou ce is: throu h t e cond or 1 switch h tthe m te 3 al thro the 'eehd ter o the net hr he 5i, rel a n h lat e andl o i the met r to rev lve i he o s "min the pp sit i 1. and ra sin thedo gin un t i2 vert call o th sub-:fr me i- In the event-the operatorshould not open the itch -52 time unit 1 2 will strike the swi h sllustr t d n Fi ure peni the ei u t a dste s th d s :u it 2,

I will ;now describe the operation of thempvam t o the s to ard a d awayf om the e s st 1d .As t meter 3. vo ves, ai ns fo loweri th d un r frri to Fi ures 4 and 5, {the core 55 of the solenoid unit 5 2 operatethe hell :0Ihl '5 abou its pivo oi t IvJ -han a remote control switch isoperated, not h re ehewhheh t co e 5 ravels in th direction of the arrow(Fig. a) it operates the bell s 55 forcin th pi l w loc 2 wards the a 3'en a $1. 3 s e 1' 3 Wi h t ra k- A the dogging .unit i2 travelsupor downnthe sub- .fe, th sha 7 is th r vo ved, to ether w t the scr w hr ad .3,wh h m ves t d s i in r ou of th u de "Wa i, d pending on whether thedogging unit is travelling up .or idQWIl- Whe t circui thr u h he solens pe the sp in i dis ngases the gear he ran t -reel; l s e pin the in oout m v :ment o h do 5.

e-.h.. Wi h to b l mite h exact :me- @ehem ez ee stm t e as illu rat d,as oth orms of me ha ism emb d m nt may be used ti l o in withi th s nof m claims.

: ie a mr A sawm l d i eehe is comp sin a tationary frame, an elongatedvertically positioned ui e .rrnevahlv mounted on sa d sta i na y ra e, as s id y mounted .on said u r me me ns for :movin said d e v ally alsaid ui fram m ans for driving sa moving ;mean s, -means for startingsaid driving means, m ans operated by said moving means and operativeupon the stoppage of movement of the 110g by abutment with .a log -formoving said guide frame, and means operative "by the move :mentofsaidguide frame for stopping said driving means.

2. A sawmill dog mechanism comprising stationary frame, an elongatedvertically positioned guide frame movably mounted on said stationaryframe for substantially yerticalmovemen-t, means resiliently biasingsaidguide frame downwardly, a dog slidably mounted on said guide frame,means for moving said dog vertically along said guide frame, means fordriving said moving means, means for starting said driving means, meansoperated by said moving means and operative upon the stoppage ofmovement of the dog by abutment with a log for moving said guide frameupwardly, and means operative by the upward movement of said guide framefor stopping said driving means.

3. A sawmill dog mechanism comprising a ,statipnary frame, an elongatedvertically posi- ;tioned guide frame movably mounted on said stationaryframe for vertical movement, a dog s-lidably mounted on said guideframe, means for moving aid ,dog yprtically along said guide frame,means for driving said moving means, manual means for starting saiddriving means, means operated by said moving means and operat v up n thi pa o downwa d Increme of the do by ab tm nt wi h a l g for movin saidu de name means -.0pe a:t v by the move: men of ai uid fram f t pl 3 iddrive ing means, and means operative by said dog ,at the end ,of itsupward movement for steppin said d vin m ansa. .Asawmill do m hanismcomp i n a knee having a eea i a a verti ally pesi :tiened stat nery munte n sa d kn par e to said e tically posi ioned sn de am m vab ymounted on sa d s at na i e e i substan ia ly vertical mevem htaehoe s ih v med-he d on sa d gu de frame a has ca ried by said shoe, pinionsjournalled at the top bott of said guide frame, a pin n in m dia e saidt p and bottom .pinion a sh anchored to said S119? and trained aboutsaid niei hs m ans f r dr in sa d ha n "to move s id shoe verticallyalong said uid fr m an mean ope a .ve by th upwar movement of aid guideframe incident to the upward @1111 upon t bo t m pinion by aid chainthroug stop- Qhee of the deg by contact with a log in front of said kneefor stopping said ,chain driving means.

A ,sawmill dog mechanism comprising an e longated vertically positionedguide frame, ,a Shoe slidebly mounted on said guide frame, la dogslidably supported ;by .Shid shoe for sub,- stantially horizontalmovement, means for moving saidshoe zverticallyialcng said guide frame,

means operated by the imw m l .O S shoe for moving said ,dog relative tosaid shoe, and means for selectively controlling :the actuation of saiddog moving means to permit independent movement ,of said shoe awhilesaid dog is stationary thereon.

.6. A 'mechanismas defined in iclaim 5 wherein said dog moving meanscomprises a rack, parallel to said guide frame, screw mechanism formeving said ,dog horizontally in said shoe, a pinion for meshing withsaid rack, .a universal joint between said pinion and screw mechanism topermit movement of said pinion perpendicularly ,of said rack, and meansfor selectivelyengaging said pinion with said rack vto operate saidscrew mechanism.

7. A sawmill .dog mechanism comprising, in combination, a stationaryframe, a vertically positioned guide :framemovably mountedon saidstationary frame for substantially vertical move,- ment, a shoe slidablymounted on said guide frame, a dog slidably carried by said shoe forsubstantially horizontal movement, means for moving said shoe verticallyalong said guide frame, means for driving said moving means, meansoperated by movement of said shoe for moving said dog relative to saidshoe, means for limiting movement of said dog at the end of its strokewhile permitting continued operation of said dog moving means, meansoperative by said shoe moving means and operative upon the stoppage ofmovement of the dog by contact with a log for moving said guide frame,means operated by the movement of said guide frame for stopping saiddriving means, and means operated by said shoe at the upper end of itsmovement for stopping said driving means.

DOUGLAS R. McF'ERQN.

6 REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 139,264 Rodgers May 27, 1873963,770 Jones July 12, 1910 1,637,907 Langill et a1. Aug. 2, 19271,774,311 Bidwell et a1 Aug. 26, 1930 1,944,285 Haase Jan. 23, 19341,944,287 Langill Jan. 23, 1934 2,377,236 Jackson May 29, 1945

